Carbon-scraper.



R. E. VAIL.

CARBON SGRAPER.

APPLICATION FILED MAB.16, 191s.

Patented Mar. 31, 19%

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COLUMBIA Pumoomu'u C0. WASHINGTQN, u. c.

RALPH E. VAIL, OF LOS ANGELES, CALIFORNIA.

CABIBON-SCRAPER.

Specification of Letters Patent.

Patented Mar. 31, 1914.

Application filed March 15, 1913. Serial No. 754,640.

To all whom it may concern Be it known that I, RALPH E. VAIL, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Carbon-Scraper, of which the following is a specification.

This invention relates to a tool for scrap ing the interior parts of an internal combustion engine to remove the deposit of carbon, and one of the main objects of the invention is to so construct the tool that it may be inserted through a comparatively small opening and after it has passed the opening can be expanded to reach the walls to be scraped. The device is thus capable of being inserted through the part opening between the cylinder and valve chamber to scrape the carbon from the top of the cylinder and surface of the cylinder head.

A further object is to control the expansion and contraction of the scraper end of the tool from a point near the handle thereof so that even when the scraping end is inserted in the cylinder it is possible to adjust its expansion from outside the cylinder without withdrawing the tool.

Other advantages will be brought out in the following description.

Referring to the drawings: Figure 1 is a vertical section through the upper portion of a cylinder showing the tool in position for use. Fig. 2 is a perspective of the tool expanded. Fig. 3 is a perspective of the tool contracted. Fig. 4 is a plan view of the lower side of the complete tool. Fig. 5 is a section on line w -:0 Fig. 1.

The tool comprises an expansion scraper consisting of two blades 1 and 2, which are provided with beveled edges 3. Both scrapers are carried on the end of a flexible shank 4, the end of which is slit to form a tongue 5 and two side members forming a fork 6. The blade 1 is secured to the fork 6 and the blade 2 is secured to the tongue 5. The scraper l is formed with a notch 7 to re ceive the tongue 5 and allow the scraper 1 to occupy a position nearly in register with scraper 2 as indicated in Fig. 3. The natural spring of the fork 6 and tongue 5 tends to move the scrapers 1 and 2 in register with each other as shown in Fig. 8, and to spread them apart I provide an expansion bar 8, the end of which is formed with a slot 9 through which the tongue 5 passes. A loop 10 formed by the slot thus lies between the tongue 5 and fork 6 and acts to separate the tongue from the fork. The expansion bar 8 extends along the shank 4: and is slidably guided thereon by means of a bracket 11 at its rear end, the bracket 11 being slotted at 12 to allow the passage of the shank i and having a. flange 13 which may be pushed by the thumb of the operator to slide the expanslon bar in either direction and thereby expand the scrapers or allow them to spring together. Thus by moving the expansion bar rearwardly the loop 10 will force the tongue 5 and fork U farther apart thereby spreading the scraper blades, while by moving the expansion bar ftn'wardly the loop 10 will permit the tongue 5 and fork G to spring toward each other and bring the scraper blades closer together as shown in Fig. i.

In order to increase the spreading effect of the expansion bar on the scraper, I how the tongue 5 at 14: and the fork at 15 as clearly shown in Fig. 3, which makes a greater angle between the fork and tongue with respectto the loop 10 and results in spreading the blades a wider distance with a less sliding movement of the expansion bar than otherwise.

To insert the tool as indicated in Fig. 1, the upper end of the valve chamber is opened in the usual manner and then the tool may be inserted through the port while the scrapers are in collapsed condition as shown in Fig. 2} and after the sc 'apcrs have entered the cylinder the flange 13 is pushed rearwardly causing the loop 10 to spread the tongue 5 and fork 6 and move the scrapers apart bringing them into contact with the wall of the cylinder head and the upper face of the piston, and by then slightly moving the tool backward and forward it will act to scrape the carbon from the surfaces with which the blades have contact. The beveled edges of the blades assist in the scrapingaction and also make it easier to insert the scraper as they minimize catching the blades on obstructions when the tool is pushed in. The shank E and expansion bar 8 have suh'icient spring and elasticity to permit of the easy insertion of the tool as indicated in Fig. 1 and alford the necessary elasticity for the movement of the tool during the scraping operation when so inserted. The spring of the tongue 5 and fork 6 is suiiiciently strong to hold the scrapers with a proper working pressure against the surface of the scraper.

lVhat I claim is:

1. A carbon scraper comprising a single piece shank, a pair of scraping blades arranged transversely on the end of said shank, and means for causing the blades to assume a position overlapping each other with all the edges of each blade substantially in register with all the respective edges of the other blade to enable them to be inserted in the cylinder and for expanding the blades to spread their edges apart after they have been inserted.

2. A carbon scraper comprising a shank, the end of which is formed With a fork and a tongue extending between the members of the fork, a scraper on the fork, a scraper on the tongue, and means for moving the tongue and fork laterally of the shank.

3. A carbon scraper comprising a supporting shank formed with a spring fork and a spring tongue extending between the members of the fork, a scraper on the fork, a scraper on the tongue, and means for adjusting the position of the fork and tongue.

at. A carbon scraper comprising a supporting shank formed with a spring tongue and a spring fork, an expansion bar extending along the shank and formed with a slot through which said tongue extends for spreading the tongue and fork upon sliding the expansion bar.

A carbon scraper comprising a flexible shank, a flexible expansion bar slidable along said shank, a pair of scrapers carried by the shank, and means operated by the expansion bar for adjusting said scrapers laterally of the shank.

6. A carbon scraper comprising a shank, an expansion bar slidable along the shank, a bracket on the expansion bar through which the shank passes, said shank being formed with two spring members, said expansion bar having a portion movable between said spring members to spread said members apart, and scrapers carried by said spring members.

In testimony whereof, I have hereunto set my hand at Los Angeles, California this th day of March 1913.

RALPH E. VAIL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

